Never in the history of the Champions League era has a team from outside the famous top five leagues ever even come close to getting their hands on the trophy. However, before the rebranding in 1993, every now and then teams from outside the biggest leagues in Europe would cause an upset and shock the biggest clubs in world football.
Not a soul thought Red Star Belgrade would go all the way to the top in 1991, given how they were a team of young Serbians who didn't really come close to giants of world football at the time, and how 1991 was the start of the Yugoslav Wars which crippled nations like Serbia.
Red Star's route to the final was a little easier than other triumphs on this list, but they still had to get past Scottish champions Rangers, Dynamo Dresden and the-then three-time European champions, Bayern Munich.
What made all this even more impressive was not just the fact their own country was in utter chaos, but how they beat one of the best teams in all over Europe in the early 1990s in the final, Marseille. The French champions were heavy favourites in the final and backed in to win the entire thing earlier in the competition.
However, a bunch of youngsters from Serbia beat them in the final on penalties. If this isn't the biggest upset in European Cup final history, it's without question one of, if no the greatest story ever witnessed on this stage.